diff options
| author | Patrick Mochel <mochel@osdl.org> | 2002-10-15 20:54:20 -0700 |
|---|---|---|
| committer | Patrick Mochel <mochel@osdl.org> | 2002-10-15 20:54:20 -0700 |
| commit | 4278bccc2d9707c9c4ee1769b464bffe4dfd820a (patch) | |
| tree | 3e012877913aafa17597149206cc050c576ba995 /include | |
| parent | 67d93a0ad7b87d740f25f93d12eb5d5e870d7030 (diff) | |
driver model: change bus refcounting scheme to match devices'.
Based on recent changes to device refcounting/unregistration.
struct bus_type gets a ->present field, which is set when the bus is
registered. bus_unregister() is added, which only clears ->present and
calls put_bus(). get_bus() checks the ->present and returns NULL if clear.
This allows all current references to buses to keep valid structures, while
preventing any new references to the bus structure.
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/device.h | 10 |
1 files changed, 3 insertions, 7 deletions
diff --git a/include/linux/device.h b/include/linux/device.h index 80a63939f924..03c7d995e96c 100644 --- a/include/linux/device.h +++ b/include/linux/device.h @@ -56,6 +56,7 @@ struct bus_type { char * name; rwlock_t lock; atomic_t refcount; + u32 present; struct list_head node; struct list_head devices; @@ -73,14 +74,9 @@ struct bus_type { extern int bus_register(struct bus_type * bus); +extern void bus_unregister(struct bus_type * bus); -static inline struct bus_type * get_bus(struct bus_type * bus) -{ - BUG_ON(!atomic_read(&bus->refcount)); - atomic_inc(&bus->refcount); - return bus; -} - +extern struct bus_type * get_bus(struct bus_type * bus); extern void put_bus(struct bus_type * bus); extern int bus_for_each_dev(struct bus_type * bus, void * data, |